当蓝牙在您的Mac上(Mac)不工作时(when Bluetooth doesn’t work)，您无法做很多事情。一方面，将无线配件（AirPods、Magic Mouse等）连接到Mac变得不可能。同样， (Likewise)AirDrop等其他依赖蓝牙的功能也变得无用。
macOS 上的蓝牙(Bluetooth)问题有多种形式。如果您的MacBook没有间歇性地断开蓝牙连接(dropping Bluetooth connections intermittently)，它有时可能无法检测到其他蓝牙(Bluetooth)设备。情况变得更糟——你Mac的蓝牙(Bluetooth)也可能随机“消失”。当您的Mac删除菜单栏中的蓝牙(Bluetooth)图标并显示“蓝牙(Bluetooth)：不可用”错误消息时，就会发生这种情况。
我们已经调查了“蓝牙不可用”错误，并在本文中针对该问题编写了六种不同的解决方案。试一试，让我们知道哪一个发挥了魔力。
1.断开USB外围设备
尽管这看起来很奇怪，但它是“蓝牙不可用”问题的有效解决方案——至少对于某些 Mac 用户而言(some Mac users)。如果您有任何外部配件（显示器、USB集线器、打印机等）连接到 Mac 的USB端口，请拔下它们并检查是否可以恢复蓝牙(Bluetooth)功能。
我们发现USB外围设备有时会干扰 Mac 的蓝牙(Bluetooth)（和Wi-Fi），尤其是当它们靠近蓝牙(Bluetooth)天线时。为防止这种干扰，Apple 建议(Apple recommends)您：
- 将您的USB配件从Mac上移开。同样(Likewise)，您也不应该将它们放在您的Mac上。
- 避免在您的(Avoid)Mac上使用假冒的USB数据线或配件；仅使用高质量和正宗的电缆。
- 关闭不使用的USB设备。
您还可以尝试将USB配件切换到Mac上的其他(Mac)USB端口，并检查是否可以将蓝牙(Bluetooth)恢复到菜单栏。
2. 重启你的 Mac
如果断开USB配件后“(USB)蓝牙(Bluetooth)不可用”错误仍然存在，请关闭MacBook（或 i Mac）并重新打开。如果蓝牙选项在您连接(Bluetooth)USB设备后立即消失，或者您经常需要重新启动Mac才能解决此问题，请尝试下一部分中的一些高级解决方案。
3.重置蓝牙模块
重置蓝牙(Bluetooth)模块将刷新为 Mac蓝牙(Bluetooth)供电的硬件组件。
1. 按住Shift + Options keys并单击菜单栏上的蓝牙图标。(Bluetooth icon)
2. 点击调试(Debug)。
3. 点击重置蓝牙模块(Reset the Bluetooth module)。
4. 单击确定(OK)继续。
4.删除蓝牙偏好列表文件(Delete Bluetooth Preference List File)
macOS 将蓝牙(Bluetooth)设置和配置保存在一个名为蓝牙(Bluetooth)首选项文件的文件中。如果此文件损坏，您可能会在MacBook上使用(MacBook)蓝牙(Bluetooth)时遇到困难。要解决此问题，请删除MacBook的蓝牙(Bluetooth)首选项文件（也称为属性列表或 .plist 文件）。
这样做会刷新 Mac 的蓝牙(Bluetooth)并消除菜单栏上的“蓝牙(Bluetooth)不可用”错误。以下是如何完成它。
1. 转到 Mac 的主屏幕并使用Shift + Command + G快捷方式启动“转到文件夹”(Go To Folder)窗口。
或者，单击菜单栏上的 Go 并选择Go to Folder(Go to Folder)。
2. 将此路径粘贴到对话框中，然后单击Go。
~/Library/Preferences/
3.在首选项中找到名为com.apple.Bluetooth.plist的文件。(com.apple.Bluetooth.plist)
你会在这个文件夹中找到一堆文件；在搜索栏中键入蓝牙(bluetooth)以快速找到蓝牙(Bluetooth)首选项文件。
4. 右键单击文件，然后单击移动到 Bin(Move to Bin)。
如果您不想删除该文件，可以将其移动到桌面或Mac上的其他文件夹以创建备份副本。
5. 最后，重新启动您的 Mac。
当您的设备重新启动时， macOS 将生成一个新的蓝牙首选项(Bluetooth Preferences)列表文件。
5. 重置 NVRAM
您的Mac在(Mac)NVRAM（非易失性RAM）上存储与蓝牙(Bluetooth)、显示分辨率、时区、系统音量等相关的设置。如果“蓝牙(Bluetooth)不可用”错误仍然存在并且上述解决方案都无法解决问题，请尝试重置Mac的NVRAM。
关闭Mac并等待它完全关闭。按下电源按钮并立即同时按住以下键约 15 – 20 秒：Option + Command + P + R R。
这样做，您的Mac将启动并关闭。按住四个键并在Mac第二次重新启动时松开它们（即在第二次启动铃声之后或Apple标志重新出现时）。
这应该可以恢复Mac的蓝牙(Bluetooth)功能。否则，请再次关闭Mac并尝试下一个故障排除解决方案。
6. 重置 Mac 的 SMC
系统管理控制器(System Management Controller)( SMC ) 处理Mac上某些硬件组件和系统设置的性能。SMC的问题可能会影响Mac的性能并使某些功能无法使用。
因此，如果重置 Mac 的NVRAM不能修复“蓝牙不可用”错误，请改为重置SMC 。重置SMC有多种方法，采用的方法取决于您 Mac 的芯片组配置。
(Reset SMC)使用T2 安全芯片(T2 Security Chip)在Mac上(Mac)重置 SMC
2018 年或之后开发的MacBook(MacBooks)（Air或Pro）使用 Apple 的T2 Security芯片组。请按照以下步骤重置带有 T2 芯片的MacBook的(MacBooks)SMC 。
1. 关闭您的Mac并等待它完全关闭。
2. 按住以下键七秒；
- 控制(Control)（在键盘左侧）
- 选项(Option)（在键盘左侧）
- Shift（在键盘右侧）
3. 在按住上面三个键的同时，按住 Mac 的电源按钮。
4. 按住Control、Option、Shift和Power按钮 7 秒钟，然后松开。
5. 按电源(Power)按钮打开Mac并检查蓝牙(Bluetooth)现在是否正常工作。
(Reset SMC)在没有 T2 安全芯片的 Mac上(Mac Without T2 Security Chip)重置 SMC
2017 年或更早推出的MacBook(MacBooks)没有 T2 安全芯片。这是重置此类Mac的(Macs)SMC的方法。
1. 关闭你的 Mac。
2. 按住Shift + Control + Options键 — 全部位于键盘左侧（见下图）。
3. 不松开按键，按住 Mac 的电源按钮。按住这四个键（Shift + Control + Options + Power）10 秒钟然后松开。
打开Mac(Mac)电源并检查蓝牙(Bluetooth)现在是否正常工作。
在 iMac 上重置 SMC
对于桌面Mac (i Mac )，只需关闭计算机并拔下电源线即可。等待(Wait)10 – 15 秒，然后插回电源线。再等待(Wait)5 秒钟，然后再打开Mac电源。
联系 Apple 支持
如果在尝试这些故障排除解决方案后“蓝牙不可用”错误仍然存在，您应该联系 Apple 支持(contact Apple Support)或访问附近的 Apple 服务中心(nearby Apple Service Center)。Mac 的蓝牙(Bluetooth)模块可能有故障。如果是这种情况，您需要更换它。
How to Fix Bluetooth Not Available on Mac
There’s a bunch of things you cannot do when Bluetooth doesn’t work on your Mac. For one, connecting wireless accessories (AirPods, Magic Mouse, etc.) to your Mac becomes impossible. Likewise, other Bluetooth-reliant features like AirDrop also become useless.
Bluetooth issues on macOS take many forms. If your MacBook isn’t dropping Bluetooth connections intermittently, it may sometimes fail to detect other Bluetooth devices. It gets worse—your Mac’s Bluetooth can also randomly “disappear”. This happens when your Mac strikes out the Bluetooth icon in the menu bar and displays a “Bluetooth: Not Available” error message.
We’ve investigated the “Bluetooth Not Available” error and compiled six different solutions to the problem in this article. Try them out and let us know which one worked the magic.
1. Disconnect USB Peripherals
As weird as this seems, it’s an effective solution to the “Bluetooth Not Available” issue—at least for some Mac users. If you have any external accessories (monitor, USB hub, printer, etc.) connected to your Mac’s USB port, unplug them and check if that restores the Bluetooth functionality.
We discovered that USB peripherals sometimes cause interference with your Mac’s Bluetooth (and Wi-Fi), particularly if they are in close proximity with the Bluetooth antenna. To prevent this interference, Apple recommends that you:
- Move your USB accessories away from your Mac. Likewise, you shouldn’t place them on your Mac.
- Avoid using counterfeit USB cables or accessories on your Mac; use high-quality and authentic cables only.
- Power off USB devices that aren’t in use.
You can also try switching the USB accessory to a different USB port on your Mac and check if that restores the Bluetooth to the menu bar.
2. Reboot Your Mac
If the “Bluetooth Not Available” error persists after disconnecting your USB accessories, shut down your MacBook (or iMac) and turn it back on. If the Bluetooth option disappears soon as you connect a USB device, or you often have to reboot your Mac to resolve this problem, try the somewhat advanced solutions in the next section.
3. Reset the Bluetooth Module
Resetting the Bluetooth module will refresh the hardware component powering your Mac’s Bluetooth.
1. Press and hold the Shift + Options keys and click the Bluetooth icon on the menu bar.
2. Click Debug.
3. Click Reset the Bluetooth module.
4. Click OK to proceed.
4. Delete Bluetooth Preference List File
macOS saves Bluetooth settings and configurations in a file called the Bluetooth preference file. If this file gets corrupted, you might experience difficulties using Bluetooth on your MacBook. To fix this, delete your MacBook’s Bluetooth preference file (also known as property list or .plist files).
Doing so will refresh your Mac’s Bluetooth and eliminate the “Bluetooth Not Available” error on the menu bar. Here’s how to get it done.
1. Go to your Mac’s home screen and use the Shift + Command + G shortcut to launch the Go To Folder window.
Alternatively, click Go on the menu bar and select Go to Folder.
2. Paste this path below into the dialog box and click Go.
~/Library/Preferences/
3. Locate the file named com.apple.Bluetooth.plist in the Preferences.
You’ll find a bunch of files in this folder; type bluetooth in the search bar to quickly locate the Bluetooth preferences file.
4. Right-click on the file and click Move to Bin.
If you don’t want to delete the file, you can move it to the desktop or another folder on your Mac to create a backup copy.
5. Finally, reboot your Mac.
macOS will generate a new Bluetooth Preferences list file when your device comes back on.
5. Reset NVRAM
Your Mac stores settings relating to Bluetooth, display resolution, time zone, system volume, etc. on the NVRAM (non-volatile RAM). If the “Bluetooth Not Available” error persists and none of the aforementioned solutions works as a fix, try resetting your Mac’s NVRAM.
Power off your Mac and wait till it shuts down completely. Press the power button and immediately hold the following keys simultaneously for about 15 – 20 seconds: Option + Command + P + R.
In doing so, your Mac will come on and go back off. Keep holding the four keys and release them when your Mac restarts a second time (i.e. after the second startup chime or when the Apple logo reappears).
That should restore your Mac’s Bluetooth functionality. Otherwise, shut down your Mac again and try the next troubleshooting solution.
6. Reset Your Mac’s SMC
The System Management Controller (SMC) handles the performance of some hardware components and system settings on your Mac. Problems with the SMC can affect your Mac’s performance and render certain features unusable.
So if resetting your Mac’s NVRAM doesn’t fix the “Bluetooth Not Available” error, reset the SMC instead. There are different ways to reset the SMC and the method to adopt will depend on your Mac’s chipset configuration.
Reset SMC on Mac With T2 Security Chip
MacBooks (Air or Pro) developed in 2018 or later use Apple’s T2 Security chipset. Follow the steps below to reset the SMC of MacBooks with the T2 chip.
1. Power off your Mac and wait for it to shut down completely.
2. Hold the following keys for seven seconds;
- Control (on the left side of the keyboard)
- Option (on the left side of the keyboard)
- Shift (on the right side of the keyboard)
3. While holding the three keys above, press and hold your Mac’s power button.
4. Hold down the Control, Option, Shift, and Power button down for another 7 seconds and then release them.
5. Press the Power button to turn on your Mac and check if the Bluetooth now works normally.
Reset SMC on Mac Without T2 Security Chip
MacBooks introduced in 2017 or earlier don’t have the T2 security chip. Here’s how to reset the SMC of such Macs.
1. Shut down your Mac.
2. Press and hold the Shift + Control + Options keys — all on the left side of your keyboard (see image below).
3. Without releasing the keys, press and hold your Mac’s power button. Hold these four keys (Shift + Control + Options + Power) together for 10 seconds and release them.
Power on your Mac and check if Bluetooth now works.
Reset SMC on iMac
For desktop Mac (iMac), simply shut down the computer and unplug the power cable. Wait for 10 – 15 seconds and plug back the power cable. Wait for 5 more seconds before you power on the Mac.
Contact Apple Support
If the “Bluetooth Not Available” error continues after trying these troubleshooting solutions, you should contact Apple Support or visit a nearby Apple Service Center. It’s possible that your Mac’s Bluetooth module is faulty. If that’s the case, you’ll need to get it replaced.
